I don't see why that would matter, you don't need another TV just a computer/mobile connected to the same network.
Anyways you can use various add-ons that use RetroArch, one of them is the IARL launcher GitHub - zach-morris/plugin.program.iarl: Internet Archive ROM Launcher (IARL) will download ROMs from the Internet Archive and launch them with Kodi
there is another one called "Bolts-On!" but its banned on this forum.
you could also use Lakka Lakka - The DIY open source retrogaming emulation console directly and hopefully they have made the changes to output CVBS, it doesn't use EmulationStation tho.
Thank you for your reply, the problem is that i use wifi and cant set wifi connection if i dont see anything on the screen...=x
dont get me wrong, i would love so much to have your software running here but i dont know why it just doesnt works on my setup =x
If we could find a way to config it directly on the usb card it could help somehow but as far as you dont support cvbs 480p its almost impossible for me to use it =x
I tried to boot lakka without success on this box =-x even with the dtb.img that i do use on libreelec.